Yeah, I'm less discounting Bioblaster as a good skill on it's own and more complaining about the problem of HAVING to use it. And that is an expert example, imagine if Ninja had to use every single one of their Ninjutsus in a row. Imagine if you had to Raiju, then Huton, then Suiton, THEN you're allowed to Hyosho and THEN you're allowed to Gokka, and that's not even the best order because you kind of want your stuns to follow a DoT and then your big hit to hit them while they're low. But if you're forced into an order than you're not exactly expressing any skills aside from where to DUMP your skills away.
Hell, I can easily see myself using Air Anchor - Drill and keep swapping between them for poking harassment, and then closing in with Bioblaster - Chain Saw for finishers. That would indeed be an infinitely less restrictive system and wouldn't FORCE me to find a situation to use Bioblaster in just so I can move on with the rest of my machinery.
I can already see the mapping: New button - Reassemble (Same Icon and Animation), press it to select a multitool (Like you would Ninjutsu), then Blast Charge turns into Drill, Bishop Autoturret turns into Air Anchor, Reassemble turns into Chain Saw and Scatter Gun turns into Bioblaster. (You keep Analysis unchanged so you can decide if you want to Analysis or not after you press the Machinery button.)
Bioblaster isn't bad. The slow is, you're literally shoving a slow on a momment where the guy needs to move the least to hit you. Heavy isn't bad, but when you're getting closer to them is the worst time to slow them. But the damage itself and the damage of the DoT is perfect, especially because it keeps ticking on Guard (Which would be REALLY useful if Drill wasn't shoe-horned to work BEFORE Bioblaster...) It was EVEN BETTER when they allowed Wildfire to explode on Bioblaster ticks, but I'm guessing it was too hard to make it so it didn't count as an extra 4th stack of Wildfire if it ticked together with a last shot, or they just wanted to make Bioblaster the worst it could be.
But the way the skill is layed out, I'd really rather have it be a poison grenade that you just put on a 25y distance, 5y radius instead of the cone. It would literally be less area, but at least I wouldn't be shoved into Melee to be allowed to reach for my Air Anchor. Or just make it rotate with Scatter Gun, which would'nt be the best since you kind of want your Scatter Gun ready at all times for Wildfire (Not for the knockback, though, that thing NEVER works in the right direction). Or in any other way that I get to use my other multitool gadgetry without being Bioblaster blocked.